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Build a better DC-AC inverter contest

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Carbon_Rod
Wed Jul 23 2014, 12:44AM Print
Carbon_Rod Registered Member #65 Joined: Thu Feb 09 2006, 06:43AM
Location:
Posts: 1155
Google has thrown down the gauntlet, and I'm sure many folks on 4hv would do well to enter the event:
Link2

Best of luck... wink
Rod
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Mads Barnkob
Wed Jul 23 2014, 07:07AM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
In brief, the other specifications are :

Must be able to handle up to 2 kVA loads
Must achieve a power density of equal to or greater than 50 W/in3
Must be able to handle loads with power factors from 0.7–1, leading and lagging in an islanded mode
Must be in a rectangular metal enclosure of no more than 40 in3
Will be taking in 450 V DC power in series with a 10 Ω resistor
Must output 240 V, 60 Hz AC single phase power
Must have a total harmonic distortion + noise on both voltage and current of < 5%
Must have an input ripple current of < 20%
Must have an input ripple voltage of < 3%
Must have a DC-AC efficiency of greater than 95%
Must maintain a temperature of no more than 60°C during operation everywhere on the outside of the device that can be touched.
Must conform to Electromagnetic Compliance standards as set out in FCC Part 15 B
Can not use any external source of cooling (e.g. water) other than air
Does not require galvanic isolation

Complete set of competition rules in PDF: Link2


I think the space limitations will throw off most people, you will properly see students in the fields of semiconductors/magnetics win this since you will need some expensive GaN switches to make a transformerless design or some moonmetalwitchcraft hybridtransformer.


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Artlav
Thu Jul 24 2014, 11:33AM
Artlav Registered Member #8120 Joined: Thu Nov 15 2012, 06:06PM
Location: Moscow, Russia
Posts: 94
240V at 60Hz?
South Korea, Philippines, Peru and a bunch of island states.
Peculiar choice, to say the least.

Also, i was under impression that the DC-DC part is the most lossy and voluminous?
Unless they want to find new ways of making sine wave inverters.
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Patrick
Thu Jul 24 2014, 05:45PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Artlav wrote ...

Also, i was under impression that the DC-DC part is the most lossy and voluminous?
Unless they want to find new ways of making sine wave inverters.
i dont see why this has to be true.
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Steve Conner
Thu Jul 24 2014, 05:48PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I believe they're thinking of the PV market where they typically connect the panels in 450V series strings (to avoid the need for said bulky DC-DC) and feed the output back into the grid with an inverter. The contest is all about improving these grid intertied inverters as there is expected to be a huge market for them in future.

The entries aren't required to operate in an intertied mode, but that is just a minor detail in the control circuitry, it doesn't really affect the design of the power electronics.

Not that I'm in the slightest interested in the contest, move along, nothing to see here smile
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...
Thu Jul 24 2014, 07:29PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Artlav wrote ...

240V at 60Hz?
South Korea, Philippines, Peru and a bunch of island states.
Peculiar choice, to say the least.
Or you know, most of the US/canada/mexico

It is an interesting design challenge, the requirement on THD really does limit you to running a nice GaN device and some nicely optimized magnetics, although I think that modern server power supplies already are at the power density with
normal' fets and whatnot (running backwards of course, 240v ac in -> 12v/48v out)
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Adrenaline
Thu Jul 24 2014, 07:57PM
Adrenaline Registered Member #235 Joined: Wed Feb 22 2006, 04:59PM
Location:
Posts: 80
The DC side ripple requirement is harder to meet than the AC THD. The AC THD is 'easy' to fix with high switching frequency to miniaturize the filter components, however the DC ripple is going to need some clever control algorithm.
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Artlav
Thu Jul 24 2014, 09:12PM
Artlav Registered Member #8120 Joined: Thu Nov 15 2012, 06:06PM
Location: Moscow, Russia
Posts: 94
wrote ...
Or you know, most of the US/canada/mexico
Huh?
Aren't USA & north america a 120V area?
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Houdini0118
Thu Jul 24 2014, 11:37PM
Houdini0118 Registered Member #8558 Joined: Thu Dec 06 2012, 11:38PM
Location: usa
Posts: 57
We are but the feeds that come into the house are 240 60hz with a grounded center tap to give 2 120v buses.
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Steve Conner
Fri Jul 25 2014, 07:14AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yes, and larger appliances like electric stoves and air conditioners often run off the 240V. In other words, even though Americans "use" 120V they still admit that it's a wimpy voltage and useless for serious electrical power. cheesey

I thought GaN was best for lower voltage applications. This looks like a job for silicon carbide.
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